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Income Taxes - The Components of Net Deferred Income Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Net deferred income tax assets: |  |
Accrued expenses and reserves | $ 12,587 | $ 8,810
Stock-based compensation | 3,285 | 4,844
Software | (1,532) | (1,556)
Goodwill | (9,109) | (7,431)
Net operating loss carryforwards | 26,893 | 25,989
Property and equipment | (8,816) | (4,410)
Deferred revenue | 4,020 | 1,307
State Taxes | 1,804 | 1,387
Contingent payments | (1,017) | (1,710)
Foreign exchange gain/loss | 1,406 | 1,340
Operating lease right-of-use assets and lease liabilities | 1,962 | 1,611
Other | 512 | 522
Total deferred income tax assets | 26,796 | 22,932
Less: valuation allowance | (21,700) | (19,916)
Net deferred income tax assets | 5,096 | 3,016
Client Contracts |  |
Net deferred income tax assets: |  |
Client contracts and related intangibles | $ (5,199) | $ (7,771)

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